. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . e horseshoe form, and that the armature is of the Gramme type, as in previous models. The machine is designed to deliver normally 6 horse-power, butupon test it has been driven to as high as 11 horse-power without injurious effect. At the Singer Manufacturing exhibit in the International Electrical Exhibitionat Philadelphia in 1884 were seen several sewing machines run by various electric motors Fio. 4
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . e horseshoe form, and that the armature is of the Gramme type, as in previous models. The machine is designed to deliver normally 6 horse-power, butupon test it has been driven to as high as 11 horse-power without injurious effect. At the Singer Manufacturing exhibit in the International Electrical Exhibitionat Philadelphia in 1884 were seen several sewing machines run by various electric motors Fio. 4.—Griscom motor. MOTORS, ELECTRIC. 541 invented by Mr. Philip Diehl, the inventor engaged by the sewing machine company. Alater design is shown in Fig. 7. in which it will be seen that the field magnets are placedvertically and hinged at the top. being sup])orted by two side rods, cast solid with the lower ends of the field magnets encircle the armature, which is also carried by journalbearings in the side rods. The method of regulation of the motor consists in separating thepole pieces from the armature. This is accomplished by means of two connecting rods fixed. Fiu. 5.—Daft motor. to the lower ends of the magnets, and joined together by a pin which slides in a slot on theupright. A rod connected to the pin serves to raise and lower the upper ends of tlio two con-necting rods, and in doing so the field magnets are separated or brought together, as the casemay be. When used in connection with a sewing machine, the motor is secured to the underside of the table in an inverteil position, and the regulating lever connected to the this position the field magnets fall apart of their own weight and the machine does notwork. It is only when the treadle is pressed and the magnets are brought together that mo-tion is obtained. It is evident that by varying the distance between the armature and themagnets any desired speed can be obtained for fast or slow work. T
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